流体机械2017，Vol.45Issue(1)：20-25,54,7.DOI:10.3969/j.issn.1005-0329.2017.01.004
多孔喷嘴能量转化效率分析
Energy Conversion Efficiency of the Multi-orificenozzle
摘要
Abstract
As the "core" of radial jet drilling (RJD) technology,the multi-orifice nozzle must forcefully self-feed and effectively break the rock to form a radial hole.But nozzle discharge coefficient of the multi-orifice nozzleis always smaller than 0.6 in most cases that means only less than 36 percent hydraulic energy transfers to the fluid.It is extremely important to study the changing law of the nozzle discharge coefficient of the multi-orifice nozzle.According to the definition of nozzle discharge coefficient,its exact expression of the multi-orifice nozzle was derived.Local resistance coefficient and effects of numbers of orifice and flow rate on the nozzle discharge coefficient werestudied by experiment.Results show that the square of the nozzle discharge coefficient represents the energy conversion efficiency of the multi-orifice nozzle;the nozzle discharge coefficient of multi-orifice nozzle depends on the discharge coefficient and weight ratio of the single orifice;the discharge coefficient of each orifice lies on the frictional resistant coefficient and the local resistance coefficient;most of the energy loss of each orifice wascaused by local resistance;local resistancewould slightly decrease with flow rate while greatly increase with the number of orifice.关键词
径向水平井/多孔喷嘴/喷嘴流量系数/能量转换效率Key words
radial jet drilling/multi-orifice nozzle/nozzle discharge coefficient/energy conversion efficiency分类
机械制造引用本文复制引用
李敬彬,李根生,黄中伟,宋先知..多孔喷嘴能量转化效率分析[J].流体机械,2017,45(1):20-25,54,7.基金项目
国家863计划项目(2015AA043401) （2015AA043401）
国家科技重大专项(2011ZX05036002) （2011ZX05036002）
中国石油大学(北京)科学基金项目(2462013BJRC002) （北京）
